Abstract
Wind power fluctuations usually cause grid frequency deviations, which could have a significant impact on an isolated power system. This paper proposes a dispatch strategy of the energy storage (ES) to support grid frequency stability of the isolated power system. The dispatch strategy of the ES is based on the forecasted mean wind speed and the corresponding standard deviation. Based on the dispatching scheme, a power spectrum density (PSD)-based method has been developed for sizing the ES and validated through system simulations based on the actual wind speed data and real isolated system in China. Results presented in this paper have shown demonstrated that the cycle-life of the ES can be significantly saved by using the proposed dispatch strategy. The developed ES sizing method has taken the random characteristics of wind power fluctuations and the frequency responses of the system into full consideration. Therefore, the proposed dispatch strategy and sizing method of the ES is general and can be applied to other isolated power systems with the ES being used to support grid frequency stability.
Highlights
In recent years, due to the lack of appropriate support of grid infrastructure and management, a large amount of remotely installed wind power in China has not been connected to the power transmission network as planned
When wind penetration is high, the isolated system may not be able to cope with the level of perturbations to keep the grid frequency deviations within the limit required by system security
This is because: i) there is no automatic generation control (AGC) in the isolated system; ii) there is no external support from the main transmission network; iii) wind power fluctuations will be relatively strong due to the high correlation between wind farms
Summary
Due to the lack of appropriate support of grid infrastructure and management, a large amount of remotely installed wind power in China has not been connected to the power transmission network as planned. When wind penetration is high, the isolated system may not be able to cope with the level of perturbations to keep the grid frequency deviations within the limit required by system security. This paper examines the strategy that the ES is only activated when the maximum of the evaluated grid frequency deviations for the dispatch/control cycle is over a certain secure limitation. In this case, the operational lifetime of the ES will be considerably prolonged. Constitutes a large proportion of the total cost of a wind energy project Such life-cycle saving dispatch strategy is meant to reduce the application cost of the project. Since the proposed method may be mathematically complex to some readers, in order to provide a clear demonstration, the introduction of the method will be accompanied by the test results of the power system throughout the paper
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